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break statement is required to immediately come out of While loop when "not grabbed" is TRUE. Since break is not there, so it goes ahead with putting None type object in Queue, which results in error as None Type object is dequeued in last dequeue operation.
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break statement is required to immediately come out of While loop when "not grabbed" is TRUE. Since break is not there, so it goes ahead with putting None type object in Queue, which results in error as None Type object is dequeued in last dequeue operation.